diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4fcbb0dfd..6b1a22120 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 ### Fixed
 
 - Refactor Helper/Html. [PR #4359](https://github.com/PHPOffice/PhpSpreadsheet/pull/4359)
+- Better handling of defined names on sheets whose titles include apostrophes. [Issue #4356](https://github.com/PHPOffice/PhpSpreadsheet/issues/4356) [Issue #4362](https://github.com/PHPOffice/PhpSpreadsheet/issues/4362) [Issue #4376](https://github.com/PHPOffice/PhpSpreadsheet/issues/4376) [PR #4360](https://github.com/PHPOffice/PhpSpreadsheet/pull/4360)
 
 ## 2025-02-08 - 4.0.0
 
diff --git a/src/PhpSpreadsheet/Calculation/Calculation.php b/src/PhpSpreadsheet/Calculation/Calculation.php
index 45807e577..665c04f10 100644
--- a/src/PhpSpreadsheet/Calculation/Calculation.php
+++ b/src/PhpSpreadsheet/Calculation/Calculation.php
@@ -4408,7 +4408,9 @@ class Calculation
                             if ($rangeWS1 !== '') {
                                 $rangeWS1 .= '!';
                             }
-                            $rangeSheetRef = trim($rangeSheetRef, "'");
+                            if (str_starts_with($rangeSheetRef, "'")) {
+                                $rangeSheetRef = Worksheet::unApostrophizeTitle($rangeSheetRef);
+                            }
                             [$rangeWS2, $val] = Worksheet::extractSheetTitle($val, true);
                             if ($rangeWS2 !== '') {
                                 $rangeWS2 .= '!';
@@ -4766,18 +4768,18 @@ class Calculation
                             }
                         }
                         if (str_contains($operand1Data['reference'] ?? '', '!')) {
-                            [$sheet1, $operand1Data['reference']] = Worksheet::extractSheetTitle($operand1Data['reference'], true);
+                            [$sheet1, $operand1Data['reference']] = Worksheet::extractSheetTitle($operand1Data['reference'], true, true);
                         } else {
                             $sheet1 = ($pCellWorksheet !== null) ? $pCellWorksheet->getTitle() : '';
                         }
                         $sheet1 ??= '';
 
-                        [$sheet2, $operand2Data['reference']] = Worksheet::extractSheetTitle($operand2Data['reference'], true);
+                        [$sheet2, $operand2Data['reference']] = Worksheet::extractSheetTitle($operand2Data['reference'], true, true);
                         if (empty($sheet2)) {
                             $sheet2 = $sheet1;
                         }
 
-                        if (trim($sheet1, "'") === trim($sheet2, "'")) {
+                        if ($sheet1 === $sheet2) {
                             if ($operand1Data['reference'] === null && $cell !== null) {
                                 if (is_array($operand1Data['value'])) {
                                     $operand1Data['reference'] = $cell->getCoordinate();
@@ -5495,7 +5497,7 @@ class Calculation
             $worksheetName = $worksheet->getTitle();
 
             if (str_contains($range, '!')) {
-                [$worksheetName, $range] = Worksheet::extractSheetTitle($range, true);
+                [$worksheetName, $range] = Worksheet::extractSheetTitle($range, true, true);
                 $worksheet = ($this->spreadsheet === null) ? null : $this->spreadsheet->getSheetByName($worksheetName);
             }
 
@@ -5557,7 +5559,7 @@ class Calculation
 
         if ($worksheet !== null) {
             if (str_contains($range, '!')) {
-                [$worksheetName, $range] = Worksheet::extractSheetTitle($range, true);
+                [$worksheetName, $range] = Worksheet::extractSheetTitle($range, true, true);
                 $worksheet = ($this->spreadsheet === null) ? null : $this->spreadsheet->getSheetByName($worksheetName);
             }
 
diff --git a/src/PhpSpreadsheet/Calculation/Information/Value.php b/src/PhpSpreadsheet/Calculation/Information/Value.php
index 49361ef06..18274651f 100644
--- a/src/PhpSpreadsheet/Calculation/Information/Value.php
+++ b/src/PhpSpreadsheet/Calculation/Information/Value.php
@@ -45,7 +45,7 @@ class Value
 
         $cellValue = Functions::trimTrailingRange($value);
         if (preg_match('/^' . Calculation::CALCULATION_REGEXP_CELLREF . '$/ui', $cellValue) === 1) {
-            [$worksheet, $cellValue] = Worksheet::extractSheetTitle($cellValue, true);
+            [$worksheet, $cellValue] = Worksheet::extractSheetTitle($cellValue, true, true);
             if (!empty($worksheet) && $cell->getWorksheet()->getParentOrThrow()->getSheetByName($worksheet) === null) {
                 return false;
             }
diff --git a/src/PhpSpreadsheet/Calculation/Internal/ExcelArrayPseudoFunctions.php b/src/PhpSpreadsheet/Calculation/Internal/ExcelArrayPseudoFunctions.php
index 2bccab8da..83ea458a2 100644
--- a/src/PhpSpreadsheet/Calculation/Internal/ExcelArrayPseudoFunctions.php
+++ b/src/PhpSpreadsheet/Calculation/Internal/ExcelArrayPseudoFunctions.php
@@ -15,7 +15,7 @@ class ExcelArrayPseudoFunctions
     {
         $worksheet = $cell->getWorksheet();
 
-        [$referenceWorksheetName, $referenceCellCoordinate] = Worksheet::extractSheetTitle($cellReference, true);
+        [$referenceWorksheetName, $referenceCellCoordinate] = Worksheet::extractSheetTitle($cellReference, true, true);
         if (preg_match('/^([$]?[a-z]{1,3})([$]?([0-9]{1,7})):([$]?[a-z]{1,3})([$]?([0-9]{1,7}))$/i', "$referenceCellCoordinate", $matches) === 1) {
             $ourRow = $cell->getRow();
             $firstRow = (int) $matches[3];
@@ -44,7 +44,7 @@ class ExcelArrayPseudoFunctions
         //$coordinate = $cell->getCoordinate();
         $worksheet = $cell->getWorksheet();
 
-        [$referenceWorksheetName, $referenceCellCoordinate] = Worksheet::extractSheetTitle($cellReference, true);
+        [$referenceWorksheetName, $referenceCellCoordinate] = Worksheet::extractSheetTitle($cellReference, true, true);
         $referenceCell = ($referenceWorksheetName === '')
             ? $worksheet->getCell((string) $referenceCellCoordinate)
             : $worksheet->getParentOrThrow()
diff --git a/src/PhpSpreadsheet/Calculation/LookupRef/Helpers.php b/src/PhpSpreadsheet/Calculation/LookupRef/Helpers.php
index 191144bfd..21c2030cd 100644
--- a/src/PhpSpreadsheet/Calculation/LookupRef/Helpers.php
+++ b/src/PhpSpreadsheet/Calculation/LookupRef/Helpers.php
@@ -61,8 +61,7 @@ class Helpers
     {
         $sheetName = '';
         if (str_contains($cellAddress, '!')) {
-            [$sheetName, $cellAddress] = Worksheet::extractSheetTitle($cellAddress, true);
-            $sheetName = trim($sheetName, "'");
+            [$sheetName, $cellAddress] = Worksheet::extractSheetTitle($cellAddress, true, true);
         }
 
         $worksheet = ($sheetName !== '')
diff --git a/src/PhpSpreadsheet/Calculation/LookupRef/Offset.php b/src/PhpSpreadsheet/Calculation/LookupRef/Offset.php
index 260ccc3a5..9d201ff22 100644
--- a/src/PhpSpreadsheet/Calculation/LookupRef/Offset.php
+++ b/src/PhpSpreadsheet/Calculation/LookupRef/Offset.php
@@ -7,6 +7,7 @@ use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
 use PhpOffice\PhpSpreadsheet\Cell\Cell;
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
+use PhpOffice\PhpSpreadsheet\Worksheet\Validations;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
 
 class Offset
@@ -55,6 +56,10 @@ class Offset
         if (!is_object($cell)) {
             return ExcelError::REF();
         }
+        $sheet = $cell->getParent()?->getParent(); // worksheet
+        if ($sheet !== null) {
+            $cellAddress = Validations::definedNameToCoordinate($cellAddress, $sheet);
+        }
 
         [$cellAddress, $worksheet] = self::extractWorksheet($cellAddress, $cell);
 
@@ -62,12 +67,11 @@ class Offset
         if (strpos($cellAddress, ':')) {
             [$startCell, $endCell] = explode(':', $cellAddress);
         }
-        [$startCellColumn, $startCellRow] = Coordinate::coordinateFromString($startCell);
-        [$endCellColumn, $endCellRow] = Coordinate::coordinateFromString($endCell);
+        [$startCellColumn, $startCellRow] = Coordinate::indexesFromString($startCell);
+        [, $endCellRow, $endCellColumn] = Coordinate::indexesFromString($endCell);
 
         $startCellRow += $rows;
-        $startCellColumn = Coordinate::columnIndexFromString($startCellColumn) - 1;
-        $startCellColumn += $columns;
+        $startCellColumn += $columns - 1;
 
         if (($startCellRow <= 0) || ($startCellColumn < 0)) {
             return ExcelError::REF();
@@ -103,8 +107,7 @@ class Offset
 
         $sheetName = '';
         if (str_contains($cellAddress, '!')) {
-            [$sheetName, $cellAddress] = Worksheet::extractSheetTitle($cellAddress, true);
-            $sheetName = trim($sheetName, "'");
+            [$sheetName, $cellAddress] = Worksheet::extractSheetTitle($cellAddress, true, true);
         }
 
         $worksheet = ($sheetName !== '')
diff --git a/src/PhpSpreadsheet/Chart/DataSeriesValues.php b/src/PhpSpreadsheet/Chart/DataSeriesValues.php
index 70f90bf78..6da4bc4aa 100644
--- a/src/PhpSpreadsheet/Chart/DataSeriesValues.php
+++ b/src/PhpSpreadsheet/Chart/DataSeriesValues.php
@@ -446,7 +446,7 @@ class DataSeriesValues extends Properties
                 }
                 unset($dataValue);
             } else {
-                [$worksheet, $cellRange] = Worksheet::extractSheetTitle($this->dataSource, true);
+                [, $cellRange] = Worksheet::extractSheetTitle($this->dataSource, true);
                 $dimensions = Coordinate::rangeDimension(str_replace('$', '', $cellRange ?? ''));
                 if (($dimensions[0] == 1) || ($dimensions[1] == 1)) {
                     $this->dataValues = Functions::flattenArray($newDataValues);
diff --git a/src/PhpSpreadsheet/Reader/Gnumeric.php b/src/PhpSpreadsheet/Reader/Gnumeric.php
index 6b71da029..7019b56eb 100644
--- a/src/PhpSpreadsheet/Reader/Gnumeric.php
+++ b/src/PhpSpreadsheet/Reader/Gnumeric.php
@@ -525,8 +525,8 @@ class Gnumeric extends BaseReader
                     continue;
                 }
 
-                [$worksheetName] = Worksheet::extractSheetTitle($value, true);
-                $worksheetName = trim($worksheetName, "'");
+                $value = str_replace("\\'", "''", $value);
+                [$worksheetName] = Worksheet::extractSheetTitle($value, true, true);
                 $worksheet = $this->spreadsheet->getSheetByName($worksheetName);
                 // Worksheet might still be null if we're only loading selected sheets rather than the full spreadsheet
                 if ($worksheet !== null) {
diff --git a/src/PhpSpreadsheet/Reader/Ods/DefinedNames.php b/src/PhpSpreadsheet/Reader/Ods/DefinedNames.php
index a99e3ea74..713ea550d 100644
--- a/src/PhpSpreadsheet/Reader/Ods/DefinedNames.php
+++ b/src/PhpSpreadsheet/Reader/Ods/DefinedNames.php
@@ -60,7 +60,7 @@ class DefinedNames extends BaseLoader
      */
     private function addDefinedName(string $baseAddress, string $definedName, string $value): void
     {
-        [$sheetReference] = Worksheet::extractSheetTitle($baseAddress, true);
+        [$sheetReference] = Worksheet::extractSheetTitle($baseAddress, true, true);
         $worksheet = $this->spreadsheet->getSheetByName($sheetReference);
         // Worksheet might still be null if we're only loading selected sheets rather than the full spreadsheet
         if ($worksheet !== null) {
diff --git a/src/PhpSpreadsheet/Reader/Xls/LoadSpreadsheet.php b/src/PhpSpreadsheet/Reader/Xls/LoadSpreadsheet.php
index aeda44aa2..7e24e7f11 100644
--- a/src/PhpSpreadsheet/Reader/Xls/LoadSpreadsheet.php
+++ b/src/PhpSpreadsheet/Reader/Xls/LoadSpreadsheet.php
@@ -588,8 +588,8 @@ class LoadSpreadsheet extends Xls
                             // $range should look like one of these
                             //        Foo!$C$7:$J$66
                             //        Bar!$A$1:$IV$2
-                            $explodes = Worksheet::extractSheetTitle($range, true);
-                            $sheetName = trim($explodes[0], "'");
+                            $explodes = Worksheet::extractSheetTitle($range, true, true);
+                            $sheetName = (string) $explodes[0];
                             if (!str_contains($explodes[1], ':')) {
                                 $explodes[1] = $explodes[1] . ':' . $explodes[1];
                             }
@@ -617,8 +617,9 @@ class LoadSpreadsheet extends Xls
                             //        Sheet!$A$1:$B$65536
                             //        Sheet!$A$1:$IV$2
                             if (str_contains($range, '!')) {
-                                $explodes = Worksheet::extractSheetTitle($range, true);
-                                if ($docSheet = $xls->spreadsheet->getSheetByName($explodes[0])) {
+                                $explodes = Worksheet::extractSheetTitle($range, true, true);
+                                $docSheet = $xls->spreadsheet->getSheetByName($explodes[0]);
+                                if ($docSheet) {
                                     $extractedRange = $explodes[1];
                                     $extractedRange = str_replace('$', '', $extractedRange);
 
@@ -646,11 +647,9 @@ class LoadSpreadsheet extends Xls
                 /** @var non-empty-string $formula */
                 $formula = $definedName['formula'];
                 if (str_contains($formula, '!')) {
-                    $explodes = Worksheet::extractSheetTitle($formula, true);
-                    if (
-                        ($docSheet = $xls->spreadsheet->getSheetByName($explodes[0]))
-                        || ($docSheet = $xls->spreadsheet->getSheetByName(trim($explodes[0], "'")))
-                    ) {
+                    $explodes = Worksheet::extractSheetTitle($formula, true, true);
+                    $docSheet = $xls->spreadsheet->getSheetByName($explodes[0]);
+                    if ($docSheet) {
                         $extractedRange = $explodes[1];
 
                         $localOnly = ($definedName['scope'] === 0) ? false : true;
diff --git a/src/PhpSpreadsheet/Reader/Xlsx.php b/src/PhpSpreadsheet/Reader/Xlsx.php
index 6b93c9763..465f7ee78 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx.php
@@ -1821,11 +1821,10 @@ class Xlsx extends BaseReader
                                         $definedNameValueParts = preg_split("/[ ,](?=([^']*'[^']*')*[^']*$)/miuU", $extractedRange);
                                         if (is_array($definedNameValueParts)) {
                                             // Extract sheet name
-                                            [$extractedSheetName] = Worksheet::extractSheetTitle((string) $definedNameValueParts[0], true);
-                                            $extractedSheetName = trim((string) $extractedSheetName, "'");
+                                            [$extractedSheetName] = Worksheet::extractSheetTitle((string) $definedNameValueParts[0], true, true);
 
                                             // Locate sheet
-                                            $locatedSheet = $excel->getSheetByName($extractedSheetName);
+                                            $locatedSheet = $excel->getSheetByName("$extractedSheetName");
                                         }
                                     }
 
diff --git a/src/PhpSpreadsheet/Style/Style.php b/src/PhpSpreadsheet/Style/Style.php
index 68ca39e06..022a49ac7 100644
--- a/src/PhpSpreadsheet/Style/Style.php
+++ b/src/PhpSpreadsheet/Style/Style.php
@@ -7,6 +7,7 @@ use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
 use PhpOffice\PhpSpreadsheet\Exception;
 use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
 
 class Style extends Supervisor
 {
@@ -189,7 +190,8 @@ class Style extends Supervisor
             // Uppercase coordinate and strip any Worksheet reference from the selected range
             $pRange = strtoupper($pRange);
             if (str_contains($pRange, '!')) {
-                $pRangeWorksheet = StringHelper::strToUpper(trim(substr($pRange, 0, (int) strrpos($pRange, '!')), "'"));
+                $pRangeWorksheet = StringHelper::strToUpper(substr($pRange, 0, (int) strrpos($pRange, '!')));
+                $pRangeWorksheet = Worksheet::unApostrophizeTitle($pRangeWorksheet);
                 if ($pRangeWorksheet !== '' && StringHelper::strToUpper($this->getActiveSheet()->getTitle()) !== $pRangeWorksheet) {
                     throw new Exception('Invalid Worksheet for specified Range');
                 }
diff --git a/src/PhpSpreadsheet/Worksheet/Validations.php b/src/PhpSpreadsheet/Worksheet/Validations.php
index 75de21895..4a8720dbb 100644
--- a/src/PhpSpreadsheet/Worksheet/Validations.php
+++ b/src/PhpSpreadsheet/Worksheet/Validations.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Worksheet;
 
+use Composer\Pcre\Preg;
 use PhpOffice\PhpSpreadsheet\Cell\AddressRange;
 use PhpOffice\PhpSpreadsheet\Cell\CellAddress;
 use PhpOffice\PhpSpreadsheet\Cell\CellRange;
@@ -45,7 +46,7 @@ class Validations
         if (is_string($cellRange) || is_numeric($cellRange)) {
             // Convert a single column reference like 'A' to 'A:A',
             //    a single row reference like '1' to '1:1'
-            $cellRange = (string) preg_replace('/^([A-Z]+|\d+)$/', '${1}:${1}', (string) $cellRange);
+            $cellRange = Preg::replace('/^([A-Z]+|\d+)$/', '${1}:${1}', (string) $cellRange);
         } elseif (is_object($cellRange) && $cellRange instanceof CellAddress) {
             $cellRange = new CellRange($cellRange, $cellRange);
         }
@@ -62,7 +63,7 @@ class Validations
      */
     public static function convertWholeRowColumn(?string $addressRange): string
     {
-        return (string) preg_replace(
+        return Preg::replace(
             ['/^([A-Z]+):([A-Z]+)$/i', '/^(\d+):(\d+)$/'],
             [self::SETMAXROW, self::SETMAXCOL],
             $addressRange ?? ''
@@ -114,11 +115,11 @@ class Validations
         // Uppercase coordinate
         $coordinate = strtoupper($coordinate);
         // Eliminate leading equal sign
-        $testCoordinate = (string) preg_replace('/^=/', '', $coordinate);
+        $testCoordinate = Preg::replace('/^=/', '', $coordinate);
         $defined = $worksheet->getParentOrThrow()->getDefinedName($testCoordinate, $worksheet);
         if ($defined !== null) {
             if ($defined->getWorksheet() === $worksheet && !$defined->isFormula()) {
-                $coordinate = (string) preg_replace('/^=/', '', $defined->getValue());
+                $coordinate = Preg::replace('/^=/', '', $defined->getValue());
             }
         }
 
diff --git a/src/PhpSpreadsheet/Worksheet/Worksheet.php b/src/PhpSpreadsheet/Worksheet/Worksheet.php
index 376185ed1..b992b5e88 100644
--- a/src/PhpSpreadsheet/Worksheet/Worksheet.php
+++ b/src/PhpSpreadsheet/Worksheet/Worksheet.php
@@ -23,6 +23,7 @@ use PhpOffice\PhpSpreadsheet\Exception;
 use PhpOffice\PhpSpreadsheet\ReferenceHelper;
 use PhpOffice\PhpSpreadsheet\RichText\RichText;
 use PhpOffice\PhpSpreadsheet\Shared;
+use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Style\Alignment;
 use PhpOffice\PhpSpreadsheet\Style\Color;
@@ -404,15 +405,15 @@ class Worksheet
      */
     private static function checkSheetCodeName(string $sheetCodeName): string
     {
-        $charCount = Shared\StringHelper::countCharacters($sheetCodeName);
+        $charCount = StringHelper::countCharacters($sheetCodeName);
         if ($charCount == 0) {
             throw new Exception('Sheet code name cannot be empty.');
         }
         // Some of the printable ASCII characters are invalid:  * : / \ ? [ ] and  first and last characters cannot be a "'"
         if (
             (str_replace(self::INVALID_CHARACTERS, '', $sheetCodeName) !== $sheetCodeName)
-            || (Shared\StringHelper::substring($sheetCodeName, -1, 1) == '\'')
-            || (Shared\StringHelper::substring($sheetCodeName, 0, 1) == '\'')
+            || (StringHelper::substring($sheetCodeName, -1, 1) == '\'')
+            || (StringHelper::substring($sheetCodeName, 0, 1) == '\'')
         ) {
             throw new Exception('Invalid character found in sheet code name');
         }
@@ -440,7 +441,7 @@ class Worksheet
         }
 
         // Enforce maximum characters allowed for sheet title
-        if (Shared\StringHelper::countCharacters($sheetTitle) > self::SHEET_TITLE_MAXIMUM_LENGTH) {
+        if (StringHelper::countCharacters($sheetTitle) > self::SHEET_TITLE_MAXIMUM_LENGTH) {
             throw new Exception('Maximum ' . self::SHEET_TITLE_MAXIMUM_LENGTH . ' characters allowed in sheet title.');
         }
 
@@ -869,19 +870,19 @@ class Worksheet
                 if ($this->parent->sheetNameExists($title)) {
                     // Use name, but append with lowest possible integer
 
-                    if (Shared\StringHelper::countCharacters($title) > 29) {
-                        $title = Shared\StringHelper::substring($title, 0, 29);
+                    if (StringHelper::countCharacters($title) > 29) {
+                        $title = StringHelper::substring($title, 0, 29);
                     }
                     $i = 1;
                     while ($this->parent->sheetNameExists($title . ' ' . $i)) {
                         ++$i;
                         if ($i == 10) {
-                            if (Shared\StringHelper::countCharacters($title) > 28) {
-                                $title = Shared\StringHelper::substring($title, 0, 28);
+                            if (StringHelper::countCharacters($title) > 28) {
+                                $title = StringHelper::substring($title, 0, 28);
                             }
                         } elseif ($i == 100) {
-                            if (Shared\StringHelper::countCharacters($title) > 27) {
-                                $title = Shared\StringHelper::substring($title, 0, 27);
+                            if (StringHelper::countCharacters($title) > 27) {
+                                $title = StringHelper::substring($title, 0, 27);
                             }
                         }
                     }
@@ -1189,7 +1190,7 @@ class Worksheet
 
         // Worksheet reference?
         if (str_contains($coordinate, '!')) {
-            $worksheetReference = self::extractSheetTitle($coordinate, true);
+            $worksheetReference = self::extractSheetTitle($coordinate, true, true);
 
             $sheet = $this->getParentOrThrow()->getSheetByName($worksheetReference[0]);
             $finalCoordinate = strtoupper($worksheetReference[1]);
@@ -1222,9 +1223,8 @@ class Worksheet
 
         if (Coordinate::coordinateIsRange($finalCoordinate)) {
             throw new Exception('Cell coordinate string can not be a range of cells.');
-        } elseif (str_contains($finalCoordinate, '$')) {
-            throw new Exception('Cell coordinate must not be absolute.');
         }
+        $finalCoordinate = str_replace('$', '', $finalCoordinate);
 
         return [$sheet, $finalCoordinate];
     }
@@ -1395,7 +1395,11 @@ class Worksheet
      */
     public function getStyle(AddressRange|CellAddress|int|string|array $cellCoordinate): Style
     {
+        if (is_string($cellCoordinate)) {
+            $cellCoordinate = Validations::definedNameToCoordinate($cellCoordinate, $this);
+        }
         $cellCoordinate = Validations::validateCellOrCellRange($cellCoordinate);
+        $cellCoordinate = str_replace('$', '', $cellCoordinate);
 
         // set this sheet as active
         $this->getParentOrThrow()->setActiveSheetIndex($this->getParentOrThrow()->getIndex($this));
@@ -2047,10 +2051,10 @@ class Worksheet
      */
     protected function getTableIndexByName(string $name): ?int
     {
-        $name = Shared\StringHelper::strToUpper($name);
+        $name = StringHelper::strToUpper($name);
         foreach ($this->tableCollection as $index => $table) {
             /** @var Table $table */
-            if (Shared\StringHelper::strToUpper($table->getName()) === $name) {
+            if (StringHelper::strToUpper($table->getName()) === $name) {
                 return $index;
             }
         }
@@ -3182,7 +3186,7 @@ class Worksheet
      *
      * @return ($range is non-empty-string ? ($returnRange is true ? array{0: string, 1: string} : string) : ($returnRange is true ? array{0: null, 1: null} : null))
      */
-    public static function extractSheetTitle(?string $range, bool $returnRange = false): array|null|string
+    public static function extractSheetTitle(?string $range, bool $returnRange = false, bool $unapostrophize = false): array|null|string
     {
         if (empty($range)) {
             return $returnRange ? [null, null] : null;
@@ -3194,12 +3198,27 @@ class Worksheet
         }
 
         if ($returnRange) {
-            return [substr($range, 0, $sep), substr($range, $sep + 1)];
+            $title = substr($range, 0, $sep);
+            if ($unapostrophize) {
+                $title = self::unApostrophizeTitle($title);
+            }
+
+            return [$title, substr($range, $sep + 1)];
         }
 
         return substr($range, $sep + 1);
     }
 
+    public static function unApostrophizeTitle(?string $title): string
+    {
+        $title ??= '';
+        if ($title[0] === "'" && substr($title, -1) === "'") {
+            $title = str_replace("''", "'", substr($title, 1, -1));
+        }
+
+        return $title;
+    }
+
     /**
      * Get hyperlink.
      *
@@ -3571,19 +3590,19 @@ class Worksheet
                 if ($this->parent->sheetCodeNameExists($codeName)) {
                     // Use name, but append with lowest possible integer
 
-                    if (Shared\StringHelper::countCharacters($codeName) > 29) {
-                        $codeName = Shared\StringHelper::substring($codeName, 0, 29);
+                    if (StringHelper::countCharacters($codeName) > 29) {
+                        $codeName = StringHelper::substring($codeName, 0, 29);
                     }
                     $i = 1;
                     while ($this->getParentOrThrow()->sheetCodeNameExists($codeName . '_' . $i)) {
                         ++$i;
                         if ($i == 10) {
-                            if (Shared\StringHelper::countCharacters($codeName) > 28) {
-                                $codeName = Shared\StringHelper::substring($codeName, 0, 28);
+                            if (StringHelper::countCharacters($codeName) > 28) {
+                                $codeName = StringHelper::substring($codeName, 0, 28);
                             }
                         } elseif ($i == 100) {
-                            if (Shared\StringHelper::countCharacters($codeName) > 27) {
-                                $codeName = Shared\StringHelper::substring($codeName, 0, 27);
+                            if (StringHelper::countCharacters($codeName) > 27) {
+                                $codeName = StringHelper::substring($codeName, 0, 27);
                             }
                         }
                     }
diff --git a/src/PhpSpreadsheet/Writer/Xls/Parser.php b/src/PhpSpreadsheet/Writer/Xls/Parser.php
index f552dad8a..c6581adcb 100644
--- a/src/PhpSpreadsheet/Writer/Xls/Parser.php
+++ b/src/PhpSpreadsheet/Writer/Xls/Parser.php
@@ -671,7 +671,7 @@ class Parser
     private function convertRange3d(string $token): string
     {
         // Split the ref at the ! symbol
-        [$ext_ref, $range] = PhpspreadsheetWorksheet::extractSheetTitle($token, true);
+        [$ext_ref, $range] = PhpspreadsheetWorksheet::extractSheetTitle($token, true, true);
 
         // Convert the external reference part (different for BIFF8)
         $ext_ref = $this->getRefIndex($ext_ref ?? '');
@@ -723,7 +723,7 @@ class Parser
     private function convertRef3d(string $cell): string
     {
         // Split the ref at the ! symbol
-        [$ext_ref, $cell] = PhpspreadsheetWorksheet::extractSheetTitle($cell, true);
+        [$ext_ref, $cell] = PhpspreadsheetWorksheet::extractSheetTitle($cell, true, true);
 
         // Convert the external reference part (different for BIFF8)
         $ext_ref = $this->getRefIndex($ext_ref ?? '');
diff --git a/src/PhpSpreadsheet/Writer/Xlsx/AutoFilter.php b/src/PhpSpreadsheet/Writer/Xlsx/AutoFilter.php
index d96ac096e..50b1a8f6e 100644
--- a/src/PhpSpreadsheet/Writer/Xlsx/AutoFilter.php
+++ b/src/PhpSpreadsheet/Writer/Xlsx/AutoFilter.php
@@ -24,7 +24,7 @@ class AutoFilter extends WriterPart
             $range = Coordinate::splitRange($autoFilterRange);
             $range = $range[0];
             //    Strip any worksheet ref
-            [$ws, $range[0]] = ActualWorksheet::extractSheetTitle($range[0], true);
+            [, $range[0]] = ActualWorksheet::extractSheetTitle($range[0], true);
             $range = implode(':', $range);
 
             $objWriter->writeAttribute('ref', str_replace('$', '', $range));
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/Information/IsRefTest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/Information/IsRefTest.php
index da977cf91..939aa3e33 100644
--- a/tests/PhpSpreadsheetTests/Calculation/Functions/Information/IsRefTest.php
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/Information/IsRefTest.php
@@ -6,46 +6,41 @@ namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\Information;
 
 use PhpOffice\PhpSpreadsheet\NamedRange;
 use PhpOffice\PhpSpreadsheetTests\Calculation\Functions\LookupRef\AllSetupTeardown;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 class IsRefTest extends AllSetupTeardown
 {
-    private bool $skipA13 = true;
-
-    public function testIsRef(): void
+    #[DataProvider('providerIsRef')]
+    public function testIsRef(mixed $expected, string $ref): void
     {
+        if ($expected === 'incomplete') {
+            self::markTestIncomplete('Calculation is too complicated');
+        }
         $sheet = $this->getSheet();
 
         $sheet->getParentOrThrow()->addDefinedName(new NamedRange('NAMED_RANGE', $sheet, 'C1'));
+        $sheet->getCell('A1')->setValue("=ISREF($ref)");
+        self::assertSame($expected, $sheet->getCell('A1')->getCalculatedValue());
+    }
 
-        $sheet->getCell('A1')->setValue('=ISREF(B1)');
-        $sheet->getCell('A2')->setValue('=ISREF(B1:B2)');
-        $sheet->getCell('A3')->setValue('=ISREF(B1:D4 C1:C5)');
-        $sheet->getCell('A4')->setValue('=ISREF("PHP")');
-        $sheet->getCell('A5')->setValue('=ISREF(B1*B2)');
-        $sheet->getCell('A6')->setValue('=ISREF(Worksheet2!B1)');
-        $sheet->getCell('A7')->setValue('=ISREF(NAMED_RANGE)');
-        $sheet->getCell('A8')->setValue('=ISREF(INDIRECT("' . $sheet->getTitle() . '" & "!" & "A1"))');
-        $sheet->getCell('A9')->setValue('=ISREF(INDIRECT("A1"))');
-        $sheet->getCell('A10')->setValue('=ISREF(INDIRECT("Invalid Worksheet" & "!" & "A1"))');
-        $sheet->getCell('A11')->setValue('=ISREF(INDIRECT("Invalid Worksheet" & "!A1"))');
-        $sheet->getCell('A12')->setValue('=ISREF(ZZZ1)');
-        $sheet->getCell('A13')->setValue('=ISREF(CHOOSE(2, A1, B1, C1))');
-
-        self::assertTrue($sheet->getCell('A1')->getCalculatedValue()); // Cell Reference
-        self::assertTrue($sheet->getCell('A2')->getCalculatedValue()); // Cell Range
-        self::assertTrue($sheet->getCell('A3')->getCalculatedValue()); // Complex Cell Range
-        self::assertFalse($sheet->getCell('A4')->getCalculatedValue()); // Text String
-        self::assertFalse($sheet->getCell('A5')->getCalculatedValue()); // Result of a math expression
-        self::assertTrue($sheet->getCell('A6')->getCalculatedValue()); // Cell Reference with worksheet
-        self::assertTrue($sheet->getCell('A7')->getCalculatedValue()); // Named Range
-        self::assertTrue($sheet->getCell('A8')->getCalculatedValue()); // Indirect to a Cell Reference
-        self::assertTrue($sheet->getCell('A9')->getCalculatedValue()); // Indirect to a Worksheet/Cell Reference
-        self::assertFalse($sheet->getCell('A10')->getCalculatedValue()); // Indirect to an Invalid Worksheet/Cell Reference
-        self::assertFalse($sheet->getCell('A11')->getCalculatedValue()); // Indirect to an Invalid Worksheet/Cell Reference
-        self::assertFalse($sheet->getCell('A12')->getCalculatedValue()); // Invalid Cell Reference
-        if ($this->skipA13) {
-            self::markTestIncomplete('Calculation for A13 is too complicated');
-        }
-        self::assertTrue($sheet->getCell('A13')->getCalculatedValue()); // returned Cell Reference
+    public static function providerIsRef(): array
+    {
+        return [
+            'cell reference' => [true, 'B1'],
+            'invalid cell reference' => [false, 'ZZZ1'],
+            'cell range' => [true, 'B1:B2'],
+            'complex cell range' => [true, 'B1:D4 C1:C5'],
+            'text string' => [false, '"PHP"'],
+            'math expression' => [false, 'B1*B2'],
+            'unquoted sheet name' => [true, 'Worksheet2!B1'],
+            'quoted sheet name' => [true, "'Worksheet2'!B1:B2"],
+            'quoted sheet name with apostrophe' => [true, "'Work''sheet2'!B1:B2"],
+            'named range' => [true, 'NAMED_RANGE'],
+            'unknown named range' => ['#NAME?', 'xNAMED_RANGE'],
+            'indirect to a cell reference' => [true, 'INDIRECT("A1")'],
+            'indirect to a worksheet/cell reference' => [true, 'INDIRECT("\'Worksheet\'!A1")'],
+            'indirect to invalid worksheet/cell reference' => [false, 'INDIRECT("\'Invalid Worksheet\'!A1")'],
+            'returned cell reference' => ['incomplete', 'CHOOSE(2, A1, B1, C1)'],
+        ];
     }
 }
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/LookupRef/ColumnOnSpreadsheetTest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/LookupRef/ColumnOnSpreadsheetTest.php
index a57b91eb3..d019d428b 100644
--- a/tests/PhpSpreadsheetTests/Calculation/Functions/LookupRef/ColumnOnSpreadsheetTest.php
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/LookupRef/ColumnOnSpreadsheetTest.php
@@ -54,4 +54,22 @@ class ColumnOnSpreadsheetTest extends AllSetupTeardown
         $result = $sheet->getCell('B3')->getCalculatedValue();
         self::assertSame('#NAME?', $result);
     }
+
+    public function testCOLUMNSheetWithApostrophe(): void
+    {
+        $this->setArrayAsValue();
+        $sheet = $this->getSheet();
+
+        $sheet1 = $this->getSpreadsheet()->createSheet();
+        $sheet1->setTitle("apo''strophe");
+        $this->getSpreadsheet()->addNamedRange(new NamedRange('newnr', $sheet1, '$F$5:$H$5', true)); // defined locally, only usable on sheet1
+
+        $sheet1->getCell('B3')->setValue('=COLUMN(newnr)');
+        $result = $sheet1->getCell('B3')->getCalculatedValue();
+        self::assertSame(6, $result);
+
+        $sheet->getCell('B3')->setValue('=COLUMN(newnr)');
+        $result = $sheet->getCell('B3')->getCalculatedValue();
+        self::assertSame('#NAME?', $result);
+    }
 }
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/LookupRef/OffsetTest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/LookupRef/OffsetTest.php
index c6a66c4c2..f1ad6919b 100644
--- a/tests/PhpSpreadsheetTests/Calculation/Functions/LookupRef/OffsetTest.php
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/LookupRef/OffsetTest.php
@@ -6,10 +6,11 @@ namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\LookupRef;
 
 use PhpOffice\PhpSpreadsheet\Calculation\LookupRef;
 use PhpOffice\PhpSpreadsheet\NamedRange;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 class OffsetTest extends AllSetupTeardown
 {
-    #[\PHPUnit\Framework\Attributes\DataProvider('providerOFFSET')]
+    #[DataProvider('providerOFFSET')]
     public function testOFFSET(mixed $expectedResult, null|string $cellReference = null): void
     {
         $result = LookupRef\Offset::OFFSET($cellReference);
@@ -58,4 +59,29 @@ class OffsetTest extends AllSetupTeardown
 
         self::assertSame(2, $workSheet->getCell('B2')->getCalculatedValue());
     }
+
+    public function testOffsetNamedRangeApostropheSheet(): void
+    {
+        $workSheet = $this->getSheet();
+        $workSheet->setTitle("apo'strophe");
+        $workSheet->setCellValue('A1', 1);
+        $workSheet->setCellValue('A2', 2);
+
+        $this->getSpreadsheet()->addNamedRange(new NamedRange('demo', $workSheet, '=$A$1'));
+
+        $workSheet->setCellValue('B1', '=demo');
+        $workSheet->setCellValue('B2', '=OFFSET(demo, 1, 0)');
+
+        self::assertSame(2, $workSheet->getCell('B2')->getCalculatedValue());
+    }
+
+    public function testOffsetMultiCellNamedRange(): void
+    {
+        $sheet = $this->getSheet();
+        $sheet->setCellValue('D13', 'Hello');
+        $this->getSpreadsheet()
+            ->addNamedRange(new NamedRange('CELLAREA', $sheet, '$B$6:$F$22'));
+        $sheet->setCellValue('D1', '=OFFSET(CELLAREA,7,2,1,1)');
+        self::assertSame('Hello', $sheet->getCell('D1')->getCalculatedValue());
+    }
 }
diff --git a/tests/PhpSpreadsheetTests/Calculation/ParseFormulaTest.php b/tests/PhpSpreadsheetTests/Calculation/ParseFormulaTest.php
index 4e06f9ca0..c529700ee 100644
--- a/tests/PhpSpreadsheetTests/Calculation/ParseFormulaTest.php
+++ b/tests/PhpSpreadsheetTests/Calculation/ParseFormulaTest.php
@@ -175,6 +175,18 @@ class ParseFormulaTest extends TestCase
                 ],
                 "=MIN('sheet1'!A:A) + 'sheet1'!A1",
             ],
+            'Combined Cell Reference and Column Range Unquoted Sheet' => [
+                [
+                    ['type' => 'Column Reference', 'value' => 'sheet1!A1', 'reference' => 'sheet1!A1'],
+                    ['type' => 'Column Reference', 'value' => 'sheet1!A1048576', 'reference' => 'sheet1!A1048576'],
+                    ['type' => 'Binary Operator', 'value' => ':', 'reference' => null],
+                    ['type' => 'Operand Count for Function MIN()', 'value' => 1, 'reference' => null],
+                    ['type' => 'Function', 'value' => 'MIN(', 'reference' => null],
+                    ['type' => 'Cell Reference', 'value' => 'sheet1!A1', 'reference' => 'sheet1!A1'],
+                    ['type' => 'Binary Operator', 'value' => '+', 'reference' => null],
+                ],
+                '=MIN(sheet1!A:A) + sheet1!A1',
+            ],
             'Combined Cell Reference and Column Range with quote' => [
                 [
                     ['type' => 'Column Reference', 'value' => "'Mark's sheet1'!A1", 'reference' => "'Mark's sheet1'!A1"],
diff --git a/tests/PhpSpreadsheetTests/Functional/PrintAreaTest.php b/tests/PhpSpreadsheetTests/Functional/PrintAreaTest.php
index 2918341eb..02a64eab7 100644
--- a/tests/PhpSpreadsheetTests/Functional/PrintAreaTest.php
+++ b/tests/PhpSpreadsheetTests/Functional/PrintAreaTest.php
@@ -6,6 +6,7 @@ namespace PhpOffice\PhpSpreadsheetTests\Functional;
 
 use PhpOffice\PhpSpreadsheet\Reader\BaseReader;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 class PrintAreaTest extends AbstractFunctional
 {
@@ -17,7 +18,7 @@ class PrintAreaTest extends AbstractFunctional
         ];
     }
 
-    #[\PHPUnit\Framework\Attributes\DataProvider('providerFormats')]
+    #[DataProvider('providerFormats')]
     public function testPageSetup(string $format): void
     {
         // Create new workbook with 6 sheets and different print areas
@@ -41,6 +42,7 @@ class PrintAreaTest extends AbstractFunctional
         $reloadedSpreadsheet = $this->writeAndReload($spreadsheet, $format, function (BaseReader $reader): void {
             $reader->setLoadSheetsOnly(['Sheet 1', 'Sheet 3', 'Sheet 4', 'Sheet 5', 'Sheet 6']);
         });
+        $spreadsheet->disconnectWorksheets();
 
         $actual1 = self::getPrintArea($reloadedSpreadsheet, 'Sheet 1');
         $actual3 = self::getPrintArea($reloadedSpreadsheet, 'Sheet 3');
@@ -52,6 +54,7 @@ class PrintAreaTest extends AbstractFunctional
         self::assertSame('A4:B4,D1:E4', $actual4, 'should be able to write and read page setup with multiple print areas');
         self::assertSame('A1:J10', $actual5, 'add by column and row');
         self::assertSame('A1:J10,L1:L10', $actual6, 'multiple add by column and row');
+        $reloadedSpreadsheet->disconnectWorksheets();
     }
 
     private static function getPrintArea(Spreadsheet $spreadsheet, string $name): string
diff --git a/tests/PhpSpreadsheetTests/Reader/Gnumeric/DefinedNameTest.php b/tests/PhpSpreadsheetTests/Reader/Gnumeric/DefinedNameTest.php
new file mode 100644
index 000000000..4733e564e
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Reader/Gnumeric/DefinedNameTest.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Gnumeric;
+
+use PhpOffice\PhpSpreadsheet\Reader\Gnumeric;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+
+class DefinedNameTest extends TestCase
+{
+    public static function fileProvider(): array
+    {
+        return [
+            ['tests/data/Reader/Gnumeric/apostrophe3a.gnumeric', 'Sheet1'],
+            ['tests/data/Reader/Gnumeric/apostrophe3b.gnumeric', 'Apo\'strophe'],
+        ];
+    }
+
+    #[DataProvider('fileProvider')]
+    public function testDefinedName(string $filename, string $sheetName): void
+    {
+        $reader = new Gnumeric();
+        $spreadsheet = $reader->load($filename);
+        $sheet = $spreadsheet->getActiveSheet();
+        self::assertSame($sheetName, $sheet->getTitle());
+        self::assertSame('=sheet1first', $sheet->getCell('C1')->getValue());
+        self::assertSame(1, $sheet->getCell('C1')->getCalculatedValue());
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Reader/Ods/DefinedNamesTest.php b/tests/PhpSpreadsheetTests/Reader/Ods/DefinedNamesTest.php
index c3d3655e9..2c3a36698 100644
--- a/tests/PhpSpreadsheetTests/Reader/Ods/DefinedNamesTest.php
+++ b/tests/PhpSpreadsheetTests/Reader/Ods/DefinedNamesTest.php
@@ -31,6 +31,28 @@ class DefinedNamesTest extends TestCase
         $spreadsheet->disconnectWorksheets();
     }
 
+    public function testDefinedNamesApostropheValue(): void
+    {
+        $filename = 'tests/data/Reader/Ods/DefinedNames.apostrophe.ods';
+        $reader = new Ods();
+        $spreadsheet = $reader->load($filename);
+        $calculation = Calculation::getInstance($spreadsheet);
+        $calculation->setInstanceArrayReturnType(
+            Calculation::RETURN_ARRAY_AS_VALUE
+        );
+        $worksheet = $spreadsheet->getActiveSheet();
+        self::assertSame("apo'strophe", $worksheet->getTitle());
+
+        $firstDefinedNameValue = $worksheet->getCell('First')->getValue();
+        $secondDefinedNameValue = $worksheet->getCell('Second')->getValue();
+        $calculatedFormulaValue = $worksheet->getCell('B2')->getCalculatedValue();
+
+        self::assertSame(3, $firstDefinedNameValue);
+        self::assertSame(4, $secondDefinedNameValue);
+        self::assertSame(12, $calculatedFormulaValue);
+        $spreadsheet->disconnectWorksheets();
+    }
+
     public function testDefinedNamesArray(): void
     {
         $filename = 'tests/data/Reader/Ods/DefinedNames.ods';
diff --git a/tests/PhpSpreadsheetTests/Reader/Xls/Issue4356Test.php b/tests/PhpSpreadsheetTests/Reader/Xls/Issue4356Test.php
new file mode 100644
index 000000000..4ac508dd2
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Reader/Xls/Issue4356Test.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xls;
+
+use PhpOffice\PhpSpreadsheet\NamedRange;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+class Issue4356Test extends AbstractFunctional
+{
+    public function testIssue4356(): void
+    {
+        // Reader couldn't handle sheet title with apostrophe for defined name.
+        // Issue was reported against Xlsx - see how Xls does.
+        $nameDefined = 'CELLNAME';
+        $originalSpreadsheet = new Spreadsheet();
+        $originalSheet = $originalSpreadsheet->getActiveSheet();
+        $originalSheet->setTitle("Goodn't sheet name");
+        $originalSpreadsheet->addNamedRange(
+            new NamedRange($nameDefined, $originalSheet, '$A$1')
+        );
+        $originalSheet->setCellValue('A1', 'This is a named cell.');
+        $originalSheet->getStyle($nameDefined)
+            ->getFont()
+            ->setItalic(true);
+        $spreadsheet = $this->writeAndReload($originalSpreadsheet, 'Xls');
+        $originalSpreadsheet->disconnectWorksheets();
+
+        $sheet = $spreadsheet->getActiveSheet();
+        $sheet->setCellValue('C1', "=$nameDefined");
+        self::assertSame('This is a named cell.', $sheet->getCell('C1')->getCalculatedValue());
+        $namedRange2 = $spreadsheet->getNamedRange($nameDefined);
+        self::assertNotNull($namedRange2);
+        $sheetx = $namedRange2->getWorksheet();
+        self::assertNotNull($sheetx);
+        $style = $sheetx->getStyle($nameDefined);
+        self::assertTrue($style->getFont()->getItalic());
+        $style->getFont()->setItalic(false);
+
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Reader/Xlsx/ApostropheTest.php b/tests/PhpSpreadsheetTests/Reader/Xlsx/ApostropheTest.php
new file mode 100644
index 000000000..dcb1d116c
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Reader/Xlsx/ApostropheTest.php
@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
+use PhpOffice\PhpSpreadsheet\NamedRange;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+class ApostropheTest extends AbstractFunctional
+{
+    public function testApostropheInSheetName(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        Calculation::getInstance($spreadsheet)
+            ->setInstanceArrayReturnType(
+                Calculation::RETURN_ARRAY_AS_ARRAY
+            );
+        $sheet = $spreadsheet->getActiveSheet();
+        $sheet->setTitle('sheet1');
+        $sheet->getCell('A1')->setValue(1);
+        $sheet->getCell('A2')->setValue(2);
+        $sheet->getCell('A3')->setValue(3);
+        $sheet->getCell('A4')->setValue(4);
+        $spreadsheet->addNamedRange(new NamedRange('sheet14cells', $sheet, '$A$1:$A$4'));
+        $sheet->getCell('C1')
+            ->setValue('=sheet14cells*sheet14cells');
+        $sheet->getCell('E1')->setValue('=ANCHORARRAY(sheet1!C1)');
+        $sheet->getCell('G1')->setValue('=SINGLE(sheet1!C1:C4)');
+
+        $sheet1 = $spreadsheet->createSheet();
+        $sheet1->setTitle("Apo'strophe");
+        $sheet1->getCell('A1')->setValue(2);
+        $sheet1->getCell('A2')->setValue(3);
+        $sheet1->getCell('A3')->setValue(4);
+        $sheet1->getCell('A4')->setValue(5);
+        $spreadsheet->addNamedRange(new NamedRange('sheet24cells', $sheet1, '$A$1:$A$4'));
+        $sheet1->getCell('C1')
+            ->setValue('=sheet24cells*sheet24cells');
+        $sheet1->getCell('E1')->setValue("=ANCHORARRAY('Apo''strophe'!C1)");
+        $sheet1->getCell('G1')->setValue("=SINGLE('Apo''strophe'!C1:C4)");
+
+        $reloadedSpreadsheet = $this->writeAndReload($spreadsheet, 'Xlsx');
+        $spreadsheet->disconnectWorksheets();
+        Calculation::getInstance($reloadedSpreadsheet)
+            ->setInstanceArrayReturnType(
+                Calculation::RETURN_ARRAY_AS_ARRAY
+            );
+        $rsheet = $reloadedSpreadsheet->getSheet(0);
+        // make sure results aren't from cache
+        $rsheet->getCell('E1')->setCalculatedValue(-1);
+        $rsheet->getCell('G1')->setCalculatedValue(-1);
+        self::assertSame([[1], [4], [9], [16]], $rsheet->getCell('C1')->getCalculatedValue());
+        self::assertSame([[1], [4], [9], [16]], $rsheet->getCell('E1')->getCalculatedValue());
+        self::assertSame(1, $rsheet->getCell('G1')->getCalculatedValue());
+
+        $rsheet1 = $reloadedSpreadsheet->getSheet(1);
+        // make sure results aren't from cache
+        $rsheet1->getCell('E1')->setCalculatedValue(-1);
+        $rsheet1->getCell('G1')->setCalculatedValue(-1);
+        self::assertSame([[4], [9], [16], [25]], $rsheet1->getCell('C1')->getCalculatedValue());
+        self::assertSame([[4], [9], [16], [25]], $rsheet1->getCell('E1')->getCalculatedValue());
+        self::assertSame(4, $rsheet1->getCell('G1')->getCalculatedValue());
+        $reloadedSpreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Reader/Xlsx/Issue4356Test.php b/tests/PhpSpreadsheetTests/Reader/Xlsx/Issue4356Test.php
new file mode 100644
index 000000000..16bb8e12f
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Reader/Xlsx/Issue4356Test.php
@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\NamedRange;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+class Issue4356Test extends AbstractFunctional
+{
+    public function testIssue4356(): void
+    {
+        // Reader couldn't handle sheet title with apostrophe for defined name
+        $nameDefined = 'CELLNAME';
+        $originalSpreadsheet = new Spreadsheet();
+        $originalSheet = $originalSpreadsheet->getActiveSheet();
+        $originalSheet->setTitle("Goodn't sheet name");
+        $originalSpreadsheet->addNamedRange(
+            new NamedRange($nameDefined, $originalSheet, '$A$1')
+        );
+        $originalSheet->setCellValue('A1', 'This is a named cell.');
+        $originalSheet->getStyle($nameDefined)
+            ->getFont()
+            ->setItalic(true);
+        $spreadsheet = $this->writeAndReload($originalSpreadsheet, 'Xlsx');
+        $originalSpreadsheet->disconnectWorksheets();
+
+        $sheet = $spreadsheet->getActiveSheet();
+        $sheet->setCellValue('C1', "=$nameDefined");
+        self::assertSame('This is a named cell.', $sheet->getCell('C1')->getCalculatedValue());
+        $namedRange2 = $spreadsheet->getNamedRange($nameDefined);
+        self::assertNotNull($namedRange2);
+        $sheetx = $namedRange2->getWorksheet();
+        self::assertNotNull($sheetx);
+        $style = $sheetx->getStyle($nameDefined);
+        self::assertTrue($style->getFont()->getItalic());
+        $style->getFont()->setItalic(false);
+
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/data/Reader/Gnumeric/apostrophe3a.gnumeric b/tests/data/Reader/Gnumeric/apostrophe3a.gnumeric
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diff --git a/tests/data/Reader/Ods/DefinedNames.apostrophe.ods b/tests/data/Reader/Ods/DefinedNames.apostrophe.ods
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